this is an Atom CPU so cant be very fast. anyway - should be enough for LXDE.
i see you are saving changes in save.dat while your booting partition is on ext2. you could get rid of save.dat and save changes directly to the partition. that should make a system a tiny bit faster.
your real RAM usage is 265MB (the rest is cache) so no need for ZRAM.

Interesting post finally. As I am concern by a better understanding of porteus and slackware. This installation might be good to play with Alien bob's kde5 I think I was not mature enough to appreciate it when it came by.

Going for a hdd full install on sdax or sda8 formatted with gparted as ext4 from an installation on sday or sda5 which is on /mnt/sday/64bit_v31/:
/mnt/sday/64bit_v31/boot/
/mnt/sday/64bit_v31/porteus/